Nikopolis ad Istrum in Moesia Inferior, 202-205 AD., Septimius Severus, 4 Assaria, Pick 1313.

Nikopolis ad Istrum in Moesia Inferior,
Septimius Severus, issued by Aurelius Gallus, 202-205 AD.,
Tetrassarion / Æ 27 (27-28 mm / 11,14 g),
Obv.: AV K Λ CEΠ - CEVHPOC ΠE , laureate head of Septimius Severus right.
Rev.: VΠ AVP ΓAΛΛOY NIKOΠOΛI ΠPOC IC , river-god Istros reclining left, holding a big branch in his r.
Pick (AMNG) 366, 1313 (1 piece listed, Löbbecke coll.) ; a depicted, double die match for Varbanov (E) 2643 (disregard the listed obv. legend) .

thanks to John Wrenn for the Varbanov reference.

for the waterplant question read:
http://www.forumancientcoins.com/board/index.php?topic=41960